<template>
    <div class="list" ref="wrapper">
        <div>
            <div class="area">
                <div class="title border-topbottom">当前城市</div>
                <div class="button-list">
                    <div class="button-wraper">
                        <div class="button">
                            <!-- {{this.$store.state.city}} -->
                            {{this.currentCity}}
                        </div>
                    </div>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                    <div 
                    class="button-wraper" 
                    v-for="item of hot" 
                    :key="item.id"
                    @click="handleCityClick(item.name)"
                    >
                        <div class="button">{{item.name}}</div>
                    </div>    
                </div>
            </div>

            <div class="area" 
            v-for="(item ,key) of cities"
            :key="key" 
            :ref="key">
                <div class="title border-topbottom">{{key}}</div>
                <div class="item-list">
                    <div class="item border-bottom"
                    v-for="innerItem of item"
                    :key="innerItem.id"
                    @click="handleCityClick(innerItem.name)"
                    >{{innerItem.name}}</div>
                </div>
            </div>
        </div>
    </div>
</template>
<script>
import Bscroll from "better-scroll"
import { mapState, mapMutations } from "vuex"
export default {
    name:'CityList',
    props:{
        hot:Array,
        cities:Object,
        letter:String
    },
    computed:{
        // city 映射给currentCity
        ...mapState({
            currentCity:'city'
        })
    },
    mounted () {
        this.scroll = new Bscroll(this.$refs.wrapper,{click:true})
    },
    methods:{
        handleCityClick(city){
            // 派发一个名字叫changeCity的action 将city传过去
            // this.$store.dispatch("changeCity",city)

            // this.$store.commit("changeCi",city);
            // ==>优化
            this.changeCi(city)
            // 路由跳转
            this.$router.push('/')
        },
        // 映射给changeCi 方法
        ...mapMutations(['changeCi'])
    },
    watch:{
        letter () {
            // better-scroll 提供有方法 自动滚动到这一块
            // console.log(this.letter)
            if(this.letter){
                // console.log(this.$refs)
                const element = this.$refs[this.letter][0]
                this.scroll.scrollToElement(element)
            }
        }
    }
}
</script>
<style scoped lang="stylus">
@import "~styles/varibles.styl"
.border-topbottom
    &:before
        border-color:#ccc
    &:after
        border-color:#ccc
.border-bottom
    &:before
        border-color:#ccc
.list
    // 控制滚动 只显示该部分内容
    overflow:hidden
    position:absolute
    // 头部显示
    top:1.58rem
    left:0
    right:0
    bottom:0
    .title
        line-height: .54rem
        background: #eee
        padding-left: .2rem
        color:#666
        font-size:.26rem
    .button-list
        overflow:hidden
        padding:.1rem .6rem .1rem .1rem
        .button-wraper
            float:left
            width:33.33%
            .button
                margin:.1rem
                padding:.1rem 0
                text-align:center
                border:.02rem solid #ccc
                border-radius: .06rem
    .item-list
        .item
            line-height:.76rem
            padding-left:.2rem


</style>
